Mitsubishi Space Star. Manual - part 63

 

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Mitsubishi Space Star. Manual - part 63

 

 

MPI  – 

Troubleshooting

13B-39

INSPECTION CHART FOR TROUBLE SYMPTOMS

Trouble symptom

Inspection
procedure
No.

Reference page

Communication
with MUT-

II

is

Communication with all systems is not possible.

1

13B-40

with MUT-

II

 is 

impossible.

Communication with engine-ECU only is not possible.

2

13B-40

Engine warning
lamp and 
related parts

The engine warning lamp does not illuminate right after the
ignition switch is turned to the ON position.

3

13B-41

related parts

The engine warning lamp remains illuminating and never goes
out.

4

13B-41

Starting

No initial combustion (starting impossible)

5

13B-42

Initial combustion but no complete combustion 
(starting impossible)

6

13B-43

Long time to start (improper starting)

7

13B-44

Idling stability 
(Improper idling)

Unstable idling (Rough idling, hunting)

8

13B-45

(Improper idling)

Idling speed is high. (Improper idling speed)

9

13B-47

Idling speed is low. (Improper idling speed)

10

13B-47

Idling stability 
(Engine stalls)

When the engine is cold, it stalls at idling. (Die out)

11

13B-48

(Engine stalls)

When the engine becomes hot, it stalls at idling. (Die out)

12

13B-49

The engine stalls when starting the car. (Pass out)

13

13B-51

The engine stalls when decelerating.

14

13B-51

Driving

Hesitation, sag or stumble

15

13B-52

The feeling of impact or vibration when accelerating

16

13B-53

The feeling of impact or vibration when decelerating

17

13B-53

Poor acceleration

18

13B-54

Surge

19

13B-55

Knocking

20

13B-56

Dieseling

21

13B-56

Too high CO and HC concentration when idling

22

13B-57

Fans (radiator fan, A/C condenser fan) are inoperative

23

13B-58

MPI  – 

Troubleshooting

13B-40

INSPECTION PROCEDURE FOR TROUBLE SYMPTOMS

INSPECTION PROCEDURE 1

Communication with MUT-

II

 is not possible.

(Communication with all systems is not possible.)

Probable cause

The cause is probably a defect in the power supply system (including earth) for
the diagnosis line.



Malfunction of the connector



Malfunction of the harness wire

Measure at the diagnosis connector
(16-pin) B-35.



Voltage between 16 and earth
OK: Battery voltage

NG

Check the following connectors:
B-75, B-81

NG

Repair

OK

Check trouble symptom.

NG

Check the harness wire between the
power supply and diagnostic connector
(16-pin), and repair if necessary.

OK

Measure at the diagnosis connector
(16-pin) B-35.



Continuity between 4 and earth



Continuity between 5 and earth
OK: Continuity

NG

Check the harness wire between the
diagnostic connector (16-pin) and
earth, and repair if necessary.

OK

Replace the MUT-

II

.

INSPECTION PROCEDURE 2

MUT-

II

 communication with engine-ECU is impossible.

Probable cause

One of the following causes may be suspected:



No power supply to engine-ECU.



Defective earth circuit of engine-ECU.



Defective engine-ECU.



Improper communication line between engine-ECU and MUT-

II



Malfunction of engine-ECU power supply circuit



Malfunction of engine-ECU



Open circuit between engine-ECU and diagnosis
connector

OK

Check the following connectors: B-09, B-19, B-30, B-35, B-60X,
B-61X

NG

Repair

Check trouble symptom.

NG

Check the harness wire between engine-ECU and diagnosis con-
nector.

OK

Check the harness wire
between engine-ECU
and earth.

NG

Repair

NG

Repair

OK

Check the power supply and ignition switch-IG system. 
(Refer to P.13B-41, INSPECTION PROCEDURE 25.)

NOTE
Though the above inspection has been performed, if trouble symptom does not disappear, check the multi
center display, and replace it if necessary.

MPI  – 

Troubleshooting

13B-41

INSPECTION PROCEDURE 3

The engine warning lamp does not illuminate right after
the ignition switch is turned to the ON position.

Probable cause

Because there is a burnt-out bulb, the engine-ECU causes the engine warning lamp
to illuminate for five seconds immediately after the ignition switch is turned to ON.
If the engine warning lamp does not illuminate immediately after the ignition switch
is turned to ON, one of the malfunctions listed at right has probably occurred.



Burnt-out bulb



Defective warning lamp circuit



Malfunction of the engine-ECU

MUT-

II

 Data list

16 Engine ECU power supply voltage (Refer to P.13B-65.)

NG

Check the engine-ECU power supply and earth circuit.
(Refer to P.13B-59, INSPECTION PROCEDURE 24.)

OK

Measure at the engine-ECU connector B-29.



Disconnect the connector, and measure at the harness side.



Earth the terminal No. 36.
OK: The engine warning lamp illuminates.

OK

Check the following
connector:
 B-29.

NG

Repair

OK

Check trouble symptom.

NG

Replace the engine-ECU.

NG

Check a burnt-out bulb.

NG

Replace

OK

Measure at the combination meter connector B-01.



Disconnect the connector, and measure at the harness side.



Voltage between 49 and earth (Ignition switch: ON)
OK: System voltage

NG

Check the engine warning lamp power supply circuit, and repair
if necessary.

OK

Check the following connectors:
B-01, B-02, B-19, B-29

NG

Repair

OK

Check trouble symptom.

NG

Check the harness wire between combination meter and engine-
ECU, and repair if necessary.

INSPECTION PROCEDURE 4

The engine warning lamp remains illuminating and never
goes out.

Probable cause

In cases such as the above, the cause is probably that the engine-ECU is detecting
a problem in a sensor or actuator, or that one of the malfunctions listed at right
has occurred.



Short-circuit between the engine warning lamp and
engine-ECU



Malfunction of the engine-ECU

MUT-

II

 Self-Diag code

Are diagnosis codes displayed?

Yes

Refer to P.13B-9, INSPECTION CHART FOR DIAGNOSIS
CODES.

No

Measure at the combination meter connector B-02.



Disconnect the connector, and measure at the harness side.



Disconnect the engine-ECU connector



Continuity between 4 and earth
OK: No continuity

NG

Check the harness wire between combination meter and engine-
ECU connector, and repair if necessary.

OK

Replace the engine-ECU.

MPI  – 

Troubleshooting

13B-42

INSPECTION PROCEDURE 5

No initial combustion (starting impossible)

Probable cause

In cases such as the above, the cause is probably that a spark plug is defective,
or that the supply of fuel to the combustion chamber is defective.
In addition, foreign materials (water, kerosene, etc.) may be mixed with the fuel.



Malfunction of the ignition system



Malfunction of the fuel pump system



Malfunction of the injectors



Malfunction of the engine-ECU



Malfunction of the immobilizer system



Foreign materials in fuel

Check battery voltage when cranking.

OK: 8 V or higher

NG

Check the battery. (Refer to GROUP 54 – Battery.)

OK

Is an immobilizer-ECU diagnosis code displayed?

Yes

Check the immobilizer. 
(Refer to GROUP 54 – Ignition Key and Immobilizer.)

OK

Can any sound be heard from the injectors when cranking?

NG

Check the injector system. (Refer to P.13B-26, INSPECTION PRO-
CEDURE FOR DIAGNOSIS CODE P0201, P0202, P0203,
P0204.)

OK

Check the following items.



Check the ignition coil, spark plugs, spark plug cables. (Refer to GROUP 16 – On-vehicle service.)



Check if the injectors are clogged.



Check if foreign materials (water, alcohol, etc.) got into fuel.



Check the compression pressure.



Check the immobilizer system. (Refer to GROUP 54 – Ignition Key and Immobilizer.)

No

MUT-

II

 Data list

16 Voltage of engine-ECU power source (Refer to P.13B-65.)

NG

Check the power supply and ignition switch-IG system. 
(Refer to P.13B-59, INSPECTION PROCEDURE 25.)

OK

Does the camshaft rotate at the engine cranking? (When oil filler
cap is removed.)

No

Check timing belt for breakage.

Yes

MUT-

II

 Self-Diag code

Are diagnosis codes displayed?

Yes

Refer to P.13B-9, INSPECTION CHART FOR DIAGNOSIS
CODES.

No

MUT-

II

 Data list

22 Crank angle sensor

OK: Cranking speed is displayed.

No

Check the crank angle sensor system. (Refer to P.13B-25, IN-
SPECTION PROCEDURE FOR DIAGNOSIS CODE P0335.)

OK

MUT-

II

 Actuator test

07 Fuel pump (Refer to P.13B-70.)

NG

Check the fuel pump system. (Refer to P.13B-60, INSPECTION
PROCEDURE 26.)

OK

MUT-

II

 Data list

21 Engine coolant temperature sensor (Refer to P.13B-65.)

NG

Check the engine coolant temperature sensor system. (Refer to
P.13B-13, INSPECTION PROCEDURE FOR DIAGNOSIS CODE
P0115.)

OK

Does the engine tachometer display the cranking speed?



Set the tachometer of primary voltage detection type.

NG

Check the ignition circuit system. 
(Refer to P.13B-63, INSPECTION PROCEDURE 31.)

OK

Check the ignition timing when cranking.

OK: Approx. 5



 BTDC

NG

Check that the distributor is installed properly.

 

 

 

 

 

 

 

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